Keto–enol tautomerism of two structurally related Schiff bases: Direct and indirect way of creation of the excited keto tautomer
作者:P. Fita、E. Luzina、T. Dziembowska、D. Kopeć、P. Piątkowski、Cz. Radzewicz、A. Grabowska
DOI:10.1016/j.cplett.2005.09.069
日期:2005.12
Femtosecond time-resolved absorption spectra of two structurally related, internally H-bonded Schiff bases are reported. The 2-hydroxynaphthylidene-1′-naphthylamine (HNAN) stable as an enol tautomer undergoes an ultrafast excited state intramolecular proton transfer, while the 2-hydroxynaphthylidene-(8′-aminoquinoline) (HNAQ), stable as a keto structure, reveals unusual relaxation routes after electronic
飞秒时间分辨的两个结构相关的,内部氢键的席夫碱的吸收光谱已报道。作为烯醇互变异构体稳定的2-羟基萘-1'-萘胺(HNAN)经历超快激发态分子内质子转移,而作为酮结构稳定的2-羟基萘-(8'-氨基喹啉)(HNAQ)表现出不同寻常电子激发后的弛豫路径。尤其是,发现了特征时间约为700 fs的漂白带上升,并归因于S 1荧光态从“热”激发态逐渐扩散。伴随TDDFT计算的结果被用于构建激发的HNAQ分子的弛豫路线图。